Thanks Scott, I will give that a try.

A switch was also running through my mind and wondered whether a traditional Gibson/Gotoh style 3 way would work? The pot holes in the boomerang control plate are quite a large diameter to fill if using a mini DPDT switch but then one of them would need to be drilled out to fit a Gotoh 3 way?

Modifying blend pot for now and see how that sounds.

Cheers, Waz